Scaffold unit



Dec. 23, 1947.

A. w. HARWELL SCAFFOLD UNIT Filed March 4, 1946 5 Sheets-SheetZ A TTORNE Y Dec. 23, 1947. A. w. HARwELL. 2,433,216

S CAFFOLD UNIT /aa /a/ /23 of a Patented Dec. 23, n1947 UNITED WMFOLDAlfred `Harwell, Birmingham, AAla..

eriicatimlMa-tcll 4, lMsgSsrel Na 2 Claims. 1

This invention relates to a scaffold unit and has for its main objectsto provide such a unit that will be comparatively cheap to manufacture,highly efficient for the purpose intended, and free of complicated partsor mechanism. Also it will possess features not heretofore used in suchstructures.

As is will known a scaffold for use in erecting brick and other types ofwalls and for other kinds of elevated work, is generally made of unitsadapted to be erected one upon another and in long or short extensionsdepending on the kind of work to be done. To be entirely satisfactoryfor such scaffolding the unit should be simple in structure for easyassembling, safe and strong, and durable to aord long and varied use.The present invention possesses such qualities. Other advantages willappear from the drawings and description.

By referring to the drawings, part of this application, it will beobserved that Fig. 1 is an elevational View of two units or sections oneupon the other on line I--I of Fig. 8; Fig. 2 is an elevational view oftwo units or sections one upon the other on line 2-2 of Fig. 8; Fig. 3is an enlarged end view of a section and part of another in dotted lineson line 3-3 of Fig. 4; Fig. 4 is an enlarged view of a section and partof another section in dotted lines on line 4-4 of Fig. 3; Fig. 5 is adetail view of a bottom support plate and joint; Fig. 6 is a detail viewon line 6 6 of Fig. 4; Fig. 7 is a detail View on line 1-1 of Fig. 3;Fig. 8 is a top plan view of an assembled unit with ends, back andfront; Fig. 9 is an elevational View of two modified end sections oneupon the other the top section being in dotted lines; Fig. 10 is anelevational view of two modified back or front sections one upon theother the top section being in dotted lines; Fig. 11 is an enlargedelevational view of one and a half of an end modlfied section the halfbeing in dotted lines; Fig. 12 is an enlarged elevational View of part0f a front or back section and a half with the half being in dottedlines; Figs. 13, 14 and 15 are detail views of the joint plates and endsof tubes.

Referring to the drawings in detail it will be seen that there are twotypes of units that are set up to form a complete scaffold unit adaptedto be placed one upon the other and side by side depending on the amountof scaffolding necessary for the job. Figures from 1 to 8 inclusiveshowone type of sections and plates for joints, and Figures 9 to 15inclusive show another type of sections and plates for joints. The endsections are made with pieces of pipe or tube indicated by I, 2, 3, 4,5, 6,1, I2, 2l, 22, 24, 25. The pieces are held by welding. A plate I3with an integral web or rib is attached by welding to form the bottomsupports or feet of the units. Another type of plate I4, I5 is attachedby welding about half way up on the type of unit section as shown inFig. 3. The plate I6 used at the top is the same for both types ofunits. The tube sections are held together to form units by angle barpieces 8, 9, I0 and I I that are bolted to the plates on the tubes usingbolt holes I8, I9 and 20. In Fig. 3 the space indicated by I1 is for thepassage of a wheelbarrow if one is used on a platform plank (not shown)resting on the cross member 5. The modified type is provided with tubepieces 23 that are slidable and removable through the section rigidtubes 24 and 25 so that different levels of platforms may be used as thecomplete units are mounted higher and higher for use on a job requiringgraduated elevation. In this type more room is provided for wheelbarrowtravel assuming platform planks are placed upon the 1 cross member o1'the tube 23 in the lower position through the fixed tubes 24 or theupper position in fixed tubes 25 of the tube section.

From the foregoing it will appear that in order to assemble a unit theend sections are bolted together by the cross angle bars being attachedto both sides of the ends to thus form a substantially square unit asshown by the top plan View Fig. 8.

The scaffold units may be made with any material suited for the purposebut I prefer to use pipe or tube pieces for the end sections and angleiron or steel bars for the cross pieces to form the back and frontsections. The plates with web or rib integral with each may be forged orwelded or may be of cast or malleable metal. Nuts and bolts are used injoints.

While I have shown and described the preferred embodiment of myinvention, I do not wish to limit same to the exact and precise detailsof structure, but reserve the right to make all modifications andchanges so long as I remain within the spirit and scope of the followingclaims.

Having described my invention I claim:

1. A scaffold unit of the class described comprising; one piece of metaltube as an horizontal base member, a piece of tube attached by weldingto each end of the base member and positioned upward at degree angle tothe base member, a cross piece of tube with each end attached by Weldingto the middle portion of each upright member and positioned parallel tothe base member, a piece of tube with one end attached by Welding in thecorner formed by the base member and one upright member and eX- tendingtherefrom at approximately 45 degrees compared to the base member andhaving its other end attached by Welding to the middle portion of thecross member, a second member attached as and being a duplicate of thepreceding member; a piece of tube attached by welding to the top end ofone upright member and extending downward therefrom at approximately 45degrees compared to the said upright member to which it is attached Withits other end bent parallel with the upright member and with its Y endattached by Welding to the cross member, another piece of tube as aduplicate of the preceding member and attached in the same Way betweenthe top of the other upright member and the cross member; the lower endsof the 4said similar members being attached to the cross mem- 5 forremovably attaching said unit to another similar unit.

ALFRED W. HARWELL.

REFERENCE S CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 15 2,043,498 Uecker June 9, 19362,126,720 Beatty et al Aug. 16, 1938 2,194,810 Reiner Mar. 26, 19402,379,446 Krueger July 3, 1945

